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Changes in biochemical constituents and induction of early sprouting by triadimefon treatment in white yam(Dioscorea rotundata Poir.) tubers during storage

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第4期8卷 283-288页

作者： JALEEL Cheruth Abdul gopi ragupathi MANIVANNAN Paramasivam KISHOREKUMAR Ashok GOMATHINAYAGAM Muthiah PANNEERSELVAM Rajaram Stress Physiology Lab Department of BotanyAnnamalai UniversityAnnamalainagar 608 002Tamil NaduIndia

The ability of triadimefon （TDM）, a triazolic fungicide, to alter the biochemical constituents and thereby minimizing the days required for sprouting in white yam （Dioscorea rotundata Poir.） tubers during storage under （30±2） ℃ in the dark, was studied. TDM at 20 mg/L was given to tubers by dipping the tubers in treatment solution containing 20 mg/L TDM on 10, 25 and 40 d after storage （DAS）. Starch, sugars, protein, amino acid contents as well as protease and a-amylase activities were estimated on 15, 30 and 45 DAS from two physiological regions viz., apical and basal regions of the tubers. In normal conditions （control） sprouting occurred on 70 to 80 DAS. The starch content decreased, while protein, amino acid, sugar contents and protease and a-amylase activities were increased due to TDM treatment and led to early sprouting.

关键词： Biochemical constituents Enzyme activities Dioscorea rotundata Sprouting Storage Triadimefon (TDM)

A Generalized Array Factor for Time-Modulated Hexagonal Based Antenna Array Geometry With Novel Trapezoidal Switching

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IEEE/CAA Journal of Automatica Sinica 2024年第9期11卷 1967-1972页

作者： gopi Ram Department of Electronics and Communication Engineering National Institute of TechnologyWarangal 506004India

The concept of the time-modulated array has been emerging as an alternative to the complex phase shifters,which lowers the cost of the array feeding network due to the utilization of radio frequency(RF)*** various forms of hexagonal antenna array geometries can be used for applications like surveillance tracking in phased array radar and wireless communication *** work proposes the generalized array factor(AF)for the hexagonal antenna array geometry based on time *** time modulation in generalized hexagonal geometry can maintain the fixed static amplitude excitation,giving more flexibility over ***,a novel trapezoidal switching function is also proposed and applied to the generalized array factor to enable future researchers to use this array factor in the field of advancement to observe how switching schemes like trapezoidal and rectangular affect the array pattern's side lobe level(SLL).The generalized equation can be utilized for the analysis and synthesis of radiation characteristics of the time-modulated hexagonal array(TMHA),time-modulated concentric hexagonal array(TMCHA),time-modulated hexagonal cylindrical array(TMHCA),and time-modulated hexagonal concentric cylindrical array(TMHCCA).The numerical result illustrates the generation of AF of time-modulated hexagonal structures and also shows that the trapezoidal switching sequence outperforms the rectangular switch using the cat swarm optimization(CSO)approach.

关键词： Hexagonal array geometry radiation pattern time-modulation trapezoidal pulse

Cosmological parameters for spatially flat dust filled Universe in Brans-Dicke theory

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Research in Astronomy and Astrophysics 2017年第3期17卷 55-66页

作者： gopi Kant Goswami Department of Mathematics Kalyan E G.CollegeBhilai-490 006C.G.India

We have investigated late time acceleration for a spatially fiat dust filled Universe in Brans- Dicke theory in the presence of a positive cosmological constant A. Expressions for Hubble＇s constant, luminosity distance and apparent magnitude have been obtained for our model. The theoretical results are compared with observed values of the latest 287 high redshift （0.3 ≤ z ≤1.4） Type Ia supernova data taken from the Union 2.1 compilation to estimate present values of matter and dark energy parame- ters, （Ωm）0 and （ΩA）0. We have also estimated the present value of Hubble＇s constant H0 in light of an updated sample of Hubble parameter measurements including 19 independent data points. The results are found to be in good agreement with recent astrophysical observations. We also calculated various physical parameters such as matter and dark energy densities, present age of the Universe and decelera- tion parameter. The value for Brans-Dicke-coupling constant ω is set to be 40 000 based on accuracy of solar system tests and recent experimental evidence.

关键词： cosmology osmological parameters - cosmology observations- dark energy-Brans-Dicke theory

An Evolutionary Approach to Improve the Beam Steering Performance over Conventional Approach in CHAA

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Journal of Communications and Information Networks 2023年第2期8卷 164-170页

作者： K Akhitha gopi Ram National Institute of Technology Warangal 506004India

In this work,evolutionary algorithms are applied for the first time to achieve better radiation characteristics over the conventional beamforming algorithm in the concentric hexagonal antenna array(CHAA),which improves the performance of wireless *** signal classification(MUSIC)algorithm is employed for direction of arrival(DoA)*** conventional adaptive beam steering algorithm,least mean-square(LMS)algorithm,is used to steer the ***,the proposed approach is employed by novel particle swarm optimization(NPSO)to reduce sidelobe level(SLL)even further.A six-ring CHAA with 126 elements for DoA estimation and beam steering is *** simulation results of the MUSIC,LMS,NPSO,and particle swarm optimization(PSO)algorithms are provided for various DoAs.

关键词： smart antenna hexagonal array PSO MUSIC algorithm LMS algorithm DoA estimation beam steering NPSO

Metallic wastewater treatment by sulfate reduction using anaerobic rotating biological contactor reactor under high metal loading conditions

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Frontiers of Environmental Science & Engineering 2018年第4期12卷 119-129页

作者： Mothe gopi Kiran Kannan Pakshirajan Gopal Das Centre for the Environment Indian Institute of Technology Guwahati Guwahati 781039 Assam India Department of Biosciences and Bioengineering Indian Institute of Technology Guwahati Guwahati 781039 Assam India Department of Chemistry Indian Institute of Technology Guwahati Guwahati 781039 Assam India

This study was aimed at investigating the performance of anaerobic rotating biological cont- reactor treating synthetic wastewater containing a mixture of heavy metals under sulfate redu condition. Statistically valid factorial design of experiments was carried out to understand dynamics of metal removal using this bioreactor system. Copper removal was maximum （〉98% followed by other heavy metals at their respective low inlet concentrations. Metal loading rates than 3.7 mg/L· h in case of Cu（II）; less than 1.69 mg/L· h for Ni（II）, Pb（II）, Zn（II）, Fe（III） and C are favorable to the performance of the An-RBC reactor. Removal efficiency of the heavy metals 1 mixture depended on the metal species and their inlet loading concentrations. Analysis of n precipitates formed in the sulfidogenic bioreactor by field emission scanning electron microscopyalong with energy dispersive X-ray spectroscopy （FESEM-EDX） confirmed metal sulfide precipitationby SRB. All these results clearly revealed that the attached growth biofilm bioreactor is well suited for heavy metal removal from complex mixture.

关键词： Factorial design analysis Sulfate reducing bacteria Multi-metal solution Heavy metal removal Anaerobic rotating biological contactorreactor High metal loading

Fixed Point Theorems in Relational Metric Spaces with an Application to Boundary Value Problems

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Journal of Partial Differential Equations 2021年第1期34卷 83-93页

作者： PRASAD gopi KHANTWAL Deepak Department of Mathematics HNB Garhwal UniversitySrinagar GarhwalIndia Department of Mathematics Graphic Era Hill UniversityDehradunIndia

In this paper,we establish fixed point theorems for generalized nonlinear contractive mappings using the concept of w-distance in relational metric *** we generalize the recent results of Senapati and Dey[*** Point Theory Appl.19,2945-2961(2017)]and many other important results relevant to this *** order to revel the usefulness of such investigations,an application to first order periodic boundary value problem are ***,we furnish a non-trivial example to demonstrate the validity of our generalization over previous existing results.

关键词： Binary relation R-lower semi-continuity relational metric spaces

A threshold voltage model of short-channel fully-depleted recessed-source/drain(Re-S/D) SOI MOSFETs with high-k dielectric

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Chinese Physics B 2015年第10期24卷 604-611页

作者： gopi Krishna Saramekala Sarvesh Dubey Pramod Kumar Tiwari Department of Electronics and Communication Engineering National Institute of Technology Shri Ramswaroop Memorial University

In this paper, a surface potential based threshold voltage model of fully-depleted（FD） recessed-source/drain（Re-S/D）silicon-on-insulator（SOI） metal-oxide semiconductor field-effect transistor（MOSFET） is presented while considering the effects of high-k gate-dielectric material induced fringing-field. The two-dimensional（2D） Poisson＇s equation is solved in a channel region in order to obtain the surface potential under the assumption of the parabolic potential profile in the transverse direction of the channel with appropriate boundary conditions. The accuracy of the model is verified by comparing the model＇s results with the 2D simulation results from ATLAS over a wide range of channel lengths and other parameters,including the dielectric constant of gate-dielectric material.

关键词： recessed-source/drain (Re-S/D) high-k gate-material fringing field and SCEs

Propagation of an electromagnetic soliton in an anisotropic biquadratic ferromagnetic medium

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Chinese Physics B 2013年第3期22卷 275-281页

作者： L.Kavitha M.Saravanan D.gopi Department of Physics Periyar University The Abdus Salam International Centre for Theoretical Physics TriesteItaly Center for Nanoscience and Nanotechnology Periyar University Department of Chemistry Periyar University

Information storage technology based on anisotropic ferromagnets with sufficiently high magneto-optical effects has received much attention in recent ***-optical recording combines the merits of magnetic and optical *** investigate the magneto-optical effects on a biquadratic ferromagnet and show that the dynamics of the system are governed by a perturbed nonlinear Schro¨dinger *** evolutions of amplitude and velocity of the soliton are found to be time independent,thereby admitting the lossless propagation of the electromagnetic soliton in the medium,which may have potential applications in soliton based optical communication *** also exploit the role of perturbation,which has a significant impact on the propagation of an electromagnetic soliton.

关键词： solitons classical spin models Maxwell equations nonlinear dynamics

Magnesium matrix composites for biomedical applications:A review

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Journal of Magnesium and Alloys 2019年第1期7卷 72-79页

作者： Vijay Kumar Bommala Mallarapu gopi Krishna ChTirumala Rao Department of Mechanical Engineering Acharya Nagarjuna UniversityGuntur-522510Andhra PradeshIndia

In recent years,a new wave of bioactive,biocompatibility and biodegradable metallic materials were developed for orthopedic *** Magnesium,Magnesium alloys,Magnesium alloy-based composites are extensive material to the biomedical applications,by virtue of its high biocompatibility and reasonable *** magnesium,Magnesium alloys can corrode too fast during the physiological conditions and loses their properties before bone *** new era for the development of magnesium-based composites can satisfy the orthopedic ***-based composites,as bio-materials,can produce adjustable mechanical properties like Ultimate tensile strength,ductility,elastic modulus,and corrosion resistance in the physiological *** the Mg based composites,the matrix materials are biomedical magnesium alloys base like Mg-Ca,Mg-Al,Mg-Zn,and Mg-REE alloy and The reinforcements are based on hydroxyapatite(HAP),calcium polyphosphate(CPP),andβ-tricalcium phosphate(β-TCP)*** comprehensive review is focused on different grades of biodegradable magnesium matrix composites including their mechanical properties and corrosion resistance.

关键词： Magnesium composites Biodegradable Biocompatible Mechanical properties Biological corrosion